This rumored update stems from the folks at Schmoes Know. The site’s sources claim that the wheels are in motion for three films set after the events of Episode III in which Obi Wan will be a flesh-and-blood character - not a force ghost. The movies "would focus on Obi-Wan’s adventures between the two trilogies as he watches over a maturing Luke Skywalker,” and are described as “standalone adventure(s), with the possibility of characters like Owen Lars and Darth Maul appearing.”
McGregor has made it clear that he’d happily return to play the Jedi master so there’s a chance we’ll discover more of his origins in this newly-spawned trilogy, which won’t be released as an Anthology title but a separate series entirely.